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题目内容
（国家开放大学报关实务）
Because of the ____ nature of our business, at times we may need emergency purchases.
A.unprincipled
B.unmistakable
C.unbelievable
D.unpredictable
A.unprincipled
B.unmistakable
C.unbelievable
D.unpredictable
参考答案
